基于3S的甘南草原水土流失现状分析

Analysis on Soil and Water Loss of Gannan Grassland at Present Based on 3S

甘南草原地处黄河、长江水源区,是黄河、长江的重要水源补给区。由于自然因素和人为因素共同作用的影响,水土流失的强度加大,尽管经过多年的综合治理和黄治工程、长治工程的实施,生态环境有所改善,但水土流失依然严重,生态环境不断恶化的趋势还没有得到根本性的遏制。国家对甘南草原水土流失治的投入较小,水土流失治理进度慢、治理程度低,水土流失的潜在危险严重。随着经济的发展和人口的增加,各类生产、建设和其他人为活动造成水土流失的现象依然存在。严重的水土流失和不断恶化的生态环境,制约着甘南草原全面奔向小康社会的步伐和社会经济的可持续发展,也危及中下游地区社会经济的发展,降低了黄河、长江的水源补给功能。

Gannan grassland is located in the water area of Yellow River and Yangtze river, which is an important water source recharge area of the Yellow River and the Yangtze river. Due to the combination of natural and human factors, the inten- sity of soil erosion increased. Despite ecological environment has been improved by years of comprehensive management , the implementation of the Huang Zhi and changzhi engineering , but the soil erosion is still serious,the trend of ecological environ- ment deterioration has not been fundamentally curbed. China has less investment in administering the loss of water and soil in Gannan grassland, though slow progress in soil erosion control and degree of governance is lower, the potential danger for soil erosion is serious. With the development of economy and the increase of population, the phenomenon of soil and water loss caused by various production, construction and other human activities still exists. The reasons restrict the Gannan grassland to the well--off society and the sustainable development of social economy are that Serious soil erosion and deteriorating ecological environment, which also endangers the socio--economic development in the lower reaches, reduces the water supply {unction of the Yellow River and the Yangtze River.